Excellent article on digital predistortion concepts
Posted: Wed Apr 26, 2023 11:41 am
Many thanks to @phaselocked for finding this article 
https://www.analog.com/media/en/analog-dialogue/volume-56/number-2/digital-predistortion-for-rf-communication.pdf
https://www.analog.com/media/en/analog-dialogue/volume-56/number-2/digital-predistortion-for-rf-communication.pdf